Double-fuel carbureter.



H; A. MILLER 61 F. M. ADAMSON.

DOUBLE FUEL CARBURETER. APPLICATION FILED MAY 4. 1914.

A Patented Maylfi, 1916.

2 wins-SHEET 1.

H. A. MILLER & F. M. ADAMSON.

DOUBLE FUEL GARBURETER. APPLICATION FILED MAY 4, 1914.

2 SHEETS-SHEET 2.

will be entirely automatic.

mg, the operator will adplst the throttle 1n ora ion.

HARRY A. AND FRANK-M. ADAMSON, OF LOS ANGELES, CALIFORNIA,

.ASSIGNORS IQ MASTER GARBUR-ETER COMPANY, OF LOS ANGELES, CALI- FQBNIA, 1. CQRIPGBATIQN 01? CALIFORNIA.

DOUBLE-FUEL can-nuances.

To all whom may concern Be it known that we, Haney A. MiLLnn and FRANK M. AnAMsoN, both citizens of the United States, residing at Los Ange-lee, in the county of Los Angeles and State of California, have invented a new and useful Double-Fuel Carbureter, of which the following is a specification.

This invention relates to a earburcter designed for using two fuels, whereby in starting the engine a lighter or more volatile fuel may be employed, andalter the engine has been started, another .iuel which may be less volatile, heavier or less expen sive, may be utilized, and. the main object of the present invention is to so construct the carburetor that the use oi these two fuels Thus, in startthe usual manner. as though h were usinga carbureter of the ordinary construction, in which a single fuel is employed. and this adjustment in the present invention will automatically operate to restrict the fuel used at such time to the lighteand more volatile startingfuel, as, for example, gaso- 1811C; after the engine has started, and as the operator opens the throttle, this adjustmen-t will automatically operate to supply the other operating fuel. ln the present embodiment after the regular running fuel is being supplied. the supply of startinp fuel still continues, but this an'iount of starting fuel is of relatively such small proportion coinpared with the regular running .fuel as to be practically negligible.

the screen broken away. 6 is a section on line w;r, Fig. 3. Fig. i is a section on line .17 ;l Fig. (i. Fig. 8 is a section on line 008M111. Fig. 6. Fig. i) is a section on line :r,r". Fig. 1'). Fig. 10 is a section on line :1, Fig. h. Fig. 11 is a section on line mr. Fig. 10. Fig. 12 is a plan vie-s the throttle. Fig. 13 is a view simi- Specification of Letters Patent.

lar to Fig. 12 showing the throttle slightly turned to the left.

The construction of the present carbureter, except for the float chamber is substantially similar both ingeneral and in detail to the construction shown in a former application of ours tiled February 10, 1914, Serial No. 617,779.-

The :arburetcr comprises a central barrel portion 1. in which the throttle 2 is revolubly mounted and over which is the neck 3, through which the mixture is discharged to the induction pipe not shown. Below the barrel 1 is a distributor chamber 4 containing a distributor 5, the distributer 5 being in the present embodiment in the form at a thin lat elongated body which extends through the distributor chamber 4 dividing the chamber into two air passages 6 and 7, air being supplied to the distributor chamber from an air inlet 8, which has an open end J and may also have several segmental side openings 10. as indicated by dotted line in Fig. 3. The openings 10 may be controlled by an external rovoluble sleeve 11, having segmental openings 12 adapted to be moved into register with the openings 10 and adjust-ably secured in the position set by a screw 13.

The throttle 2 is n'iounted on a shaft 14 iournaled in the ends of the barrel 1. and has a central passage 15 with curvilinear edge 1(3- as clearly shown in Figs. 12 and 13, which at one end is so abruptly curved as to form the side all of a transverse narrow annular passage 17. The passage 17 is segmental and does not extend entirely around the throttle, there being solid portions 18 on intervening segments of the throttle. iln arm 19 is secured to the shaft 1-1 for operating the throttle. The distributer 5 is provided with a single passage 19 in its lower portion, with which communicate a series or vertical passages 20, the upper wall of the distributor having a series of small p01f0121tl0118 21, which communicate with the respective passages 20. The upper edge 22 of the distributor is slightly below the face of the solid portion of the throttle, for example, about of an inch space he ingallowed. while at the extreme right hand side. as shown. in Fi 7 is a single perforation 23 in a raised edge'portion 24,

Patented May 16, 11916.

Application filed May 4, 7.91%. Serial No. 836,051. i

chamber to form separate air passages 6' and 7 for supplying air for the single perforation 23. A damper 26 is mounted on a shaft 27 and located in theair passage 7 to control-the amount of air allowed to pass through the passage 7. The normal air enters through the passage 6.:

The two different fuels are supplied to the distributer at the opposite ends of the dis-v tributer, which protrude from the chamber 4, and which respectively communicate with passages 28 and 28, whlch lead respectively to hollow screw plugs 29 and 29, which project into and communicate with float chambers 30 and 30. Screens 31 and 31 are secured to the ends of the respective screw plugs. 29 and 29. to prevent impurities in the fuels from entering the passages leading to the distributer. Secured to the bottom of each float chamber is a cap 32 and 32' which form sub-chambers 33 and 33, towhich the liquid fuels are supplied through nipples 34 and In each subchamber is. a screen 35 to check passage of 1 impurities, and over which screen 35 are passages 36 leading to a needle valve seat 37. 38 is a drain passage normally closed by screw plug 39. Each valve.seat 37 is controlled by needle valve l0, and freely slidable on each needle valve '40 is a float- 41 which is adapted to operate levers 42,, which engage a grooved collar 43 on the associated needle valve so that as the float rises it causes a closing movement of the needle valve, and in this way the amount of fuel in each float chamber is automatically controlled and kept at a substantially definite level therein. The two. float chambers are preferably formed as a single casing, and have'a single top cover 44 which may be secured in place by thumb-nut 45.

In operation the starting fuel is conducted to the float chamber 30, and the running fuel is fed to the floatchamber 30. When the operator turns the throttle to starting position the solid portions of the throttle cover the perforations 21, while the passage 17 of the throttle opens communication with the single perforation 23 so that the entire suction of the motor is confined to the single perforation 23, with the result that the starting fuel which enters the associated end of the distributer is sucked into the carbureter to the exclusion of the other fuel. After the motor starts and the throttle is turned further to move its curvilinear edge 16 so as to uncover some of the perforations 21, the suction then is applied to the perforations 21, and the regular running fuel is drawn through the perforations 21. As additional perforations 21 are uncovered by turning the throttle further, more fuel is admitted, although after the ports 21 have been opened to admit the regular running fuel and port 23 still remains open, the amount of fuel permitted to enter through port 23 is so slight compared to the amount which enters through the ports 21 as to be practically negligible. It will be noted that the admission of the two fuels is entirely automatic, and that no thought on the part of the operator is required, the starting fuel a single rotary valve for closing certain of said passages to confine the flow of fuel to a certain passage, said valve operating externally of the distributer and extending longitudinally thereof, means for supplying one fuel to said certain passage, and means for supplying another fuelto another passage.

2. In a carbureter, a distributer having passages for running fuel, and a passage for starting fuel,'a float chamber in communication with the first named passages for supplying one kind of fuel to said passages, another float-chamber in communication with the starting passage for supplying a starting fuel to the latter passage, and a as with separate alined parallel fuel passages,

valve for closing all of said passages the; valve being also adapted to close the first named passages to cause only starting fuel:

to pass through the starting passage.

3. In a carbureter, a distributer having passages for running fuel, and a passage for starting fuel, a float chamber in' communication with the first named passages for supplying one kind of fuel to said passages, another float chamber in communication with the starting passage for supplying a starting fuel to the latter passage, a throttle valve having a curvilinear edgelocated adjacent the distributer passages, and having a narrow passage for confining suction to the said starting passage.

4. In a carbureter, a distributer chamber,

sage for delivering fuel from one of said float chambers, and having a series of passages for delivering fuel from the other float chamber, and a throttle above said distribuweasel her for covering definite passages inthe distributer.

5. In a carbureter, a distzfilouter having a running fuel passage and. a starting fuel passage, means 'to supply one kind of fuel to the running fuel passage, means to supply another kind of fuel to the starting fuel passage, and a single valve closing the running fuel passage when the starting fuel passage is open and opening the starlslng iuel passage when the running fuel passage 1s open.

6. In a carbureter, a (llstributer havlng a running fuel passage and a starting fuel passage, means to supply one fuel to one of the passages, means to supply another fuel to another of the passages, and a single valve closing the running fuel passage anol opening the starting fuel passage when in one position and means to move the valve into different positions. 

